Originally Posted by
maddog34
It's an MTB... but due to it's age, Measuring the BB will be the only way to know for certain what width the BB is.
It will be 68 or 73mm at the frame... it is or was a triple chainring crankset, originally... most likely a Sugino brand crank... Suntour Shifters/Ders.
1988 says it was a "urban" ATB, more of a hybrid so I wouldn't be surprised to see 68mm, and yes original, that year anyway, was a Sugino triple undoubtedly square taper
https://frugalaveragebicyclist.com/w...og-pgs1-22.pdf